Number Of Species Research Articles

ToTE: A global database on trees of the treeline ecotone.

Globally, treelines form a transition zone between tree-dominated forest downslope and treeless alpine vegetation upslope. Treelines represent the highest boundary of "tree" life form in high-elevation mountains and at high latitudes. Recently, treelines have been shifting upslope in response to climate warming, so it has become important to understand global tree diversity and treeline distributions. However, to the best of our knowledge, no global database on tree flora of treelines exists, which limits our capacity to undertake macroecological analyses. Here, for the first time, we present a global data set on the trees of the treeline ecotone, supported by an online ToTE database. We synthesized the database from 1202 studies published over the last 60 years (1962 to 2022) following the Preferred Reporting Items in Systematic Reviews and Meta-Analysis (PRISMA) protocol. We classified the tree species in the database into three categories: treeline tree (TL) species, near to treeline (NTL) tree species, and tree species with an upper montane range limit (TUMR). The ToTE Version-1 presents a total of 208 tree taxa, including 189 species, five subspecies, and 14 varieties, belonging to 54 genera and 26 families distributed across 34 mountain regions worldwide that either grow exactly at the treeline or have a range limit below the treeline. Of the total taxa, 155, 14, and 39 belong to TL, NTL, and TUMR, respectively. Genera such as Abies, Picea, Pinus, Larix, and Juniperus are more represented in the treeline tree category. On the other hand, Acer, Prunus, Populus, and Quercus have more representatives in the near to treeline category, whereas Erica, Nothofagus, and Polylepis contribute more tree species with an upper montane range limit. Furthermore, families such as Rosaceae and Pinaceae include trees that occur both at the treeline and with an upper montane range limit, whereas Sapindaceae includes trees that occur exclusively near to treeline. Our database also includes information on the global distribution patterns of treeline tree species richness across mountains and biomes. The mountains with the highest number of tree species are the Andes (39) followed by the Himalaya (37). Close to 67% of tree species show restricted distributions in different mountains, with the highest endemism in the Andes and the Himalaya. In terms of tree species distribution, Pinus sylvestris was widespread, with a distribution across nine mountain regions, followed by Picea glauca and Fagus sylvatica, both distributed across five mountain regions. In terms of species' distribution across biomes, the temperate biome harbors the highest treeline tree species richness (152 species), which may reflect the fact that the majority of studies are available from the temperate regions of the world. The remaining 56 species are distributed within five other biomes, with the least in dry tropical and subarctic (four species each). Furthermore, currently 40 treeline tree species fall under different International Union for Conservation of Nature threat categories. We anticipate that our database will help advance research on macroecological, biogeographic, evolutionary, climate-change, and conservation aspects of the treeline on a global scale. The data are released under a Creative Commons Attribution 4.0 international license. Please cite this data paper when the data are reused.

Responses to phytoplankton community succession and expression of key functional genes in plateau lakes under 17β-estradiol interference

Steroid estrogens (SEs) have garnered global attention because of their potential hazards to human health and aquatic organisms at low concentrations (ng/L). The ecosystems of plateau freshwater lakes are fragile, the water lag time is long, and pollutants easily accumulate, making them more vulnerable to the impact of SEs. However, the knowledge of the impact of SEs on the growth and decomposition of phytoplankton communities in plateau lakes and the eutrophication process is limited. This study investigated the effects and mechanisms of SEs exposure on dominant algal communities and the expression of typical algal functional genes in Erhai Lake using indoor simulations and molecular biological methods. The results showed that phytoplankton were sensitive to 17β-estradiol (E2β) pollution, with a concentration of 50, and 100 ng/L E2β exposure promoting the growth of cyanophyta and chlorophyta in the short term; this poses an ecological risk of inducing algal blooms. E2β of 1000 ng/L exposure led to cross-effects of estrogenic effects and toxicity, with most phytoplankton being inhibited. However, small filamentous cyanobacteria and diatoms exhibited greater tolerance; Melosira sp. even exhibited "low inhibition, high promotion" behavior. Exposure to E2β reduced the Shannon-Wiener diversity index (H'), Pielou index (J), and the number of dominant algal species (S) in phytoplankton communities, leading to instability in community succession. E2β of 50 ng/L enhanced the expression levels of relevant functional genes, such as ftsH, psaB, atpB, and prx, related to Microcystis aeruginosa. E2β of 50 ng/L and 5 mg/L can promote the transcription of Microcystis toxins (MC) related genes (mcyA), leading to more MC production by algal cells.

Using biophysical modelling and marine connectivity to assess the risk of natural dispersal of non-indigenous species to comply with the Ballast Water Management Convention

AbstractThe introduction of Marine Non-Indigenous Species (NIS) poses a significant threat to global marine biodiversity and ecosystems. To mitigate this risk, the Ballast Water Management Convention (BWMC) was adopted by the UN International Maritime Organisation (IMO), setting strict criteria for discharges of ballast water. However, the BWMC permits exemptions for shipping routes operating within a geographical area, known as a Same-Risk-Area (SRA). An SRA can be established in areas where a risk assessment (RA) can conclude that the spread of NIS via ballast water is low relative to the predicted natural dispersal. Despite the BWMC's requirement for RAs to be based on modelling of the natural dispersal of NIS, no standard procedures have been established. This paper presents a methodology utilizing biophysical modelling and marine connectivity analyses to conduct SRA RA and delineation. Focusing on the Kattegat and Øresund connecting the North Sea and Baltic Sea, we examine two SRA candidates spanning Danish and Swedish waters. We provide an example on how to conduct an RA including an RA summary, and addressing findings, challenges, and prospects. Our study aims to advance the development and adoption of consistent, transparent, and scientifically robust SRA assessments for effective ballast water management.

Understanding non-participation in local governance institutions in Indonesia

Community-centered approaches are crucial and impactful strategies for the global climate and biodiversity crisis. However, these approaches hinge upon participation for both pragmatic and ethical reasons. While there is a growing body of research in this field, most studies focus on those who opt in to these community-based approaches. Research focuses on how interventions do or do not achieve the intended cross-sectoral outcomes that are flagship among these strategies. Few studies seek to understand the objective and subjective constraints of non-participants. We investigated why community members chose not to participate in a community-centered conservation approach in West Kalimantan, Indonesia. We used snowball saturation sampling and semi-structured interviews across nine villages, surveying both non-participants and key informants. Our results show that non-material factors such as time, lack of understanding, and feeling uninvited drove non-participation. Non-participants did not identify a lack of interest in program activities or services as a primary reason for opting out. Key informants suggested that participation could be improved with better outreach around objectives, potential benefits, and data feedback loops that quickly communicated results to community members. These results have implications for conservation strategies around the globe as findings suggest investing in non-material factors (e.g., improved messaging and considerations of time burdens) are significant constraints to participation. Payment for ecosystem services and carbon finance schemes often invest considerable time and money in incentivizing participation with material benefits, and our results suggest a more significant consideration should be placed on time requirements, messaging/outreach, adaptive feedback loops, and democratizing data ownership.

Bryofloristic diversity and conservation value of a protected area in the Brazilian semi-arid region

We collected 137 samples (71—rainy season; 66—dry) for the Brazilian state of Paraíba. With a total of 23 species (one hornwort, 14 mosses and nine liverworts), we updated the bryoflora of Paraíba, a hotspot of bryophytes, by one rare species (Weissia controversa), increasing the total number of species to 188. The floristic composition in the Poeta e Repentista Juvenal de Oliveira State Park is affected by chronic anthropogenic disturbances, and is typical of arid environments, regardless of the season. This indicates homogenization of the habitat from the loss of ecological niche due to the disordered use of local natural resources. However, the record of Philonotis hastata, categorized as Near Threatened by the IUCN; the geographic expansion of a species; and the presence of rare species for Brazil reinforce the importance of the Conservation Unit for bryophyte biodiversity. Despite the floristic composition, we identified that interpretations about biology, environmental functionality and species distribution are more consistent for environmental assessment and decision-making on conservation actions.

Listening to the response of bat and bush‐cricket communities to management regimes of powerline clearings

AbstractLinear transportation infrastructures (LTIs) are established drivers of habitat fragmentation and barrier effects. Yet, they represent an increasing surface of managed seminatural habitats where increased consideration of biodiversity outputs is needed in an era of global biodiversity decline. A combined effort by both scientists and stakeholders is, therefore, needed to evaluate the promises and limits of these alternatives so that they best achieve their conservation potential. Our study explores the effects of forest powerline clearings on biodiversity, as well as the potential benefits of integrated vegetation management (IVM) as alternatives to clear‐cuts. We recorded the acoustic activity at 35 pairs of forest/clearing stations in two forested regions of France in 2021. Our results suggest that powerline clearings represent increased movement opportunities for bats and, most particularly, edge‐foraging species. They also provide suitable habitats for bush‐cricket species, particularly species requiring thermophilic conditions. We detected no direct benefit from IVM on bat communities. However, bush‐cricket communities appeared richer, more acoustically active, and statistically different from adjacent forests in clearings favoring secondary vegetation compared with clear‐cut ones. This collaborative study provides data on understudied taxa in the context of LTIs and sheds light on conservation promises and limits associated with their management.

Exploring the impact of land use change on soil quality under different ecosystems – a case study in the Nilgiri Hill region of Western Ghats global biodiversity hotspot

Exploring the impact of land use change on soil quality under different ecosystems – a case study in the Nilgiri Hill region of Western Ghats global biodiversity hotspot

The Public Prosecutor’s Office’s experience using Global Forest Watch to monitor and deter deforestation in the Cerrado

Summary The Cerrado biome is a global biodiversity hotspot, and more than half of its area has been devastated in recent decades. Nevertheless, environmental enforcement agencies have a low capacity for monitoring and curbing illegal deforestation and fires. In this context, the local unit of the Public Prosecutor’s Office in Itiquira, Mato Grosso, has been experimenting since mid-2018 with the Global Forest Watch platform to detect illegal deforestation at its onset and notify landowners by electronic means (WhatsApp, email, etc.). With this remote inspection there has been a significant increase in the number of infraction notices, criminal actions, agreements for civil reparation of damage and public civil suits. By seeking to identify illegal deforestation in progress (in flagrant situations), the Public Prosecutor’s Office has prevented such events from turning into major deforestation. Preliminary data indicate that the practice of monitoring and notifications by the Public Prosecutor’s Office and environmental control agencies has increased law enforcement on deforestation and fires in that municipality and halted infractions at their inception. The challenge now is to determine the extent to which this method can be replicated in broader territories and other biomes such as Amazonia and Pantanal.

Extinction selectivity obscures patterns of trait‐dependent endangerment in Columbiformes

AbstractAimUnderstanding how extinction has occurred in the recent past is crucial to unravel its main drivers as well as to implement effective conservation practices to minimize global biodiversity loss. It has long been hypothesized that extinction risk is not randomly distributed among traits of species. However, the actual traits making species more prone to extinction may have been overlooked because already extinct species are often not considered in comparative analyses of extinction risk. We characterized the drivers of extinction in a cosmopolitan bird clade, including Holocene and contemporary extinctions potentially related to human impacts and provided evidence of an ‘extinction selectivity’ in species traits.LocationGlobal.Time periodAnthropocene.Major taxa studiedColumbiformes clade, pigeons and doves.MethodsWe constructed a new phylogenetic hypothesis of the Columbiformes, a cosmopolitan bird clade consisting of 33 recently extinct and 351 extant species. Then, we integrated data on geography, behaviour and morphology to reveal the drivers of extinction risk. We used phylogenetic generalized least square models to test the effect of geography, behaviour and morphology in the risk of extinction and identified differences in the drivers of extinction when including versus excluding recently extinct species.ResultsOur analysis revealed that Columbiformes endemic to islands with ground‐foraging habits, weak flying abilities, migratory behaviour and larger body sizes are more vulnerable to extinction. Our results also show that excluding recently extinct species identifies extinction drivers different from those when including recently extinct species.Main conclusionsOnly by accurately identifying the traits that increase extinction risk we can develop targeted conservation measures that promote the long‐term persistence of threatened species. Extinction selectivity has important implications for the conservation of biological communities and ultimately ecosystem functioning, considering the critical role Columbiformes often play as seed dispersers.

An assessment of future rewilding potential in the United Kingdom.

Restoring ecosystems is an imperative for addressing biodiversity loss and climate change, and achieving the targets of the Kunming-Montreal Global Biodiversity Framework. One form of restoration, rewilding, may have particular promise but may also be precluded by requirements for other forms of land use now or in the future. This opportunity space is critical but challenging to assess. We explored the potential area available for rewilding in Great Britain until the year 2080 with a multisectoral land-use model with several distinct climatic and socioeconomic scenarios. By 2080, areas from 5000 to 7000km2 were either unmanaged or managed in ways that could be consistent with rewilding across scenarios without conflicting with the provision of ecosystem services. Beyond these areas, another 24,000-42,000km2 of extensive upland management could provide additional areas for rewilding if current patterns of implementation hold in the future. None of these areas, however, coincided reliably with ecosystems of priority for conservation: peatlands, ancient woodlands, or wetlands. Repeatedly, these ecosystems were found to be vulnerable to conversion. Our results are not based on an assumption of support for or benefits from rewilding and do not account for disadvantages, such as potential losses of cultural landscapes or traditional forms of management, that were beyond the modeled ecosystem services. Nevertheless, potential areas for rewilding emerge in a variety of ways, from intensification elsewhere having a substantial but inadvertent land-sparing effect, popular demand for environmental restoration, or a desire for exclusive recreation among the wealthy elite. Our findings therefore imply substantial opportunities for rewilding in the United Kingdom but also a need for interventions to shape the nature and extent of that rewilding to maintain priority conservation areas and societal objectives.

Global arthropod beta-diversity is spatially and temporally structured by latitude

Global biodiversity gradients are generally expected to reflect greater species replacement closer to the equator. However, empirical validation of global biodiversity gradients largely relies on vertebrates, plants, and other less diverse taxa. Here we assess the temporal and spatial dynamics of global arthropod biodiversity dynamics using a beta-diversity framework. Sampling includes 129 sampling sites whereby malaise traps are deployed to monitor temporal changes in arthropod communities. Overall, we encountered more than 150,000 unique barcode index numbers (BINs) (i.e. species proxies). We assess between site differences in community diversity using beta-diversity and the partitioned components of species replacement and richness difference. Global total beta-diversity (dissimilarity) increases with decreasing latitude, greater spatial distance and greater temporal distance. Species replacement and richness difference patterns vary across biogeographic regions. Our findings support long-standing, general expectations of global biodiversity patterns. However, we also show that the underlying processes driving patterns may be regionally linked.

Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand

We describe Dixonius chotjuckdikuli sp. nov. from Khao Ebid (Mount Ibit), Khao Yoi District, Phetchaburi Province, western Thailand. The new, limestone-dwelling species differs from all currently recognized species of Dixonius by the following combination of morphological characters and pattern: maximal known snout-vent length of 45.6 mm, 18 (rarely 16) longitudinal rows of dorsal tubercles; 31 to 34 paravertebral scales; 18 (rarely 16) longitudinal rows of ventral scales across the abdomen; 20 to 22 interciliary scales; 5 or 6 precloacal pores in males, no pores in females; a marked canthal stripe extending beyond the shoulder; and a blotched dorsal pattern in males, females and juveniles. This description brings the number of Dixonius species to 17, among which seven species are endemic to Thailand.

Information content of JWST spectra of WASP-39b

The era of James Webb Space Telescope (JWST) transmission spectroscopy of exoplanetary atmospheres commenced with the study of the Saturn-mass gas giant WASP-39b as part of the Early Release Science (ERS) program. WASP-39b was observed using several different JWST instrument modes (NIRCam, NIRISS, NIRSpec G395H and NIRSpec PRISM) and the spectra were published in a series of papers by the ERS team. The current study examines the information content of these spectra measured using the different instrument modes, focusing on the complexity of the temperature-pressure profiles and number of chemical species warranted by the data. We examine if the molecules H2O CO CO2 K H2S CH4 and SO2 are detected in each of the instrument modes. Two Bayesian inference methods are used to perform atmospheric retrievals: the standard nested sampling method, as well as the supervised machine learning method of the random forest (trained on a model grid). For nested sampling, Bayesian model comparison is used as a guide to identify the set of models with the required complexity to explain the data. Generally, non-isothermal transit chords are needed to fit the transmission spectra of WASP-39b, although the complexity of the temperature-pressure profile required is mode-dependent. The minimal set of chemical species needed to fit a spectrum is mode-dependent as well, and also depends on whether grey or non-grey clouds are assumed. When a non-grey cloud model is used to fit the NIRSpec G395H spectrum, it generates a spectral continuum that compensates for the water opacity. The same compensation is absent when fitting the non-grey cloud model to the NIRSpec PRISM spectrum (which has broader wavelength coverage), suggesting that it is spurious. The interplay between the cloud spectral continuum and the water opacity determines if sulphur dioxide is needed to fit either spectrum. The inferred elemental abundances of carbon and oxygen and the carbon-to-oxygen (C/O) ratios are all mode- and model-dependent, and should be interpreted with caution. Bayesian model comparison does not always offer a clear path forward for favouring specific retrieval models (e.g. grey versus non-grey clouds) and thus for enabling unambiguous interpretations of exoplanet spectra.

All-you-can-eat buffet: A spider-specialized bat species (Myotis emarginatus) turns into a pest fly eater around cattle.

Determining the dietary spectrum of European insectivorous bats over time is the cornerstone of their conservation, as it will aid our understanding of foraging behavior plasticity in response to plummeting insect populations. Despite the global decline in insects, a restricted number of arthropod pest species thrive. Yet past research has overlooked the potential of European bats to suppress pests harmful to woodlands or livestock, in spite of their economic relevance. Here we investigated the diet composition, its breeding season variations and pest consumption of an insectivorous bat species (Myotis emarginatus), at the northern edge of its range (Wallonia, Belgium). We also explored the prey ecology to gain insight into the hunting strategies and foraging habitats of this bat species. We used DNA metabarcoding to amplify two COI markers within 195 bat droppings collected in June, July and August, thereby identifying 512 prey taxa predominated by Diptera, Araneae and Lepidoptera. Overall, in 97% of the samples we detected at least one of the 58 potential pest taxa, 41 of which targeting trees. The June samples were marked by a diet rich in orb-weaver spiders, in accordance with the archetypal diet of M. emarginatus bats. However, during the highly energy demanding July-August parturition and lactation period, roughly 55% of the dropping samples contained two cattle fly pests (Stomoxys calcitrans and Musca domestica). Moreover, among the 88 Diptera species preyed upon by M. emarginatus in July and August, these flies accounted for around 50% of the taxa occurrences. This plasticity-the switch from a spider-rich to a fly-rich diet-seems providential considering the dramatic ongoing drop in insect populations but this involves ensuring bat-friendly cattle farming. Our results revealed that bats widely consume pest entomofauna, thereby highlighting their potential role as allies of forest managers and farmers.

Data to the Malaysian Liverwort Flora, IV: a New Species of Mastigopelma Mitt. (Lepidoziaceae) from Cameron Highlands, Peninsular Malaysia

The new species, Mastigopelma latiffiana G. E. Lee, E. Pesiu et X. L. He, discovered in Pen-insular Malaysia, is described and illustrated as a new addition to the genus Mastigopelma Mitt., of the family Lepidoziaceae. The new species is corticolous, growing on a tree branch in a moist montane forest in Cameron Highlands, Pahang, at 1,900 m alt. It is characterised by the leafy shoots arising from stolons, branches, when present, all ventral-intercalary, and terminal branching lacking; asymmetrical leaves with almost straight ventral margins, rounded to truncate leaf apices, entire-margined leaves, thickened cell walls with nodular trigones, and glistening-homogeneous oil bodies (2–4 per cell); and retuse to blunt teethed underleaf apices. This discovery has increased the total number of known species of Mastigopelma Mitt. to five. An identification key to all the species of the genus is presented.

Three new species of Vaccinium L. (Ericaceae) from Mindanao Island, Philippines

Three new species of Vaccinium endemic to the island of Mindanao, Philippines are here described and illustrated. Vaccinium fallax most closely resembles V. myrtoides, but differs by having smaller leaves, caducous bracts, shorter pedicels, a broadly obconical hypanthium, broadly triangular calyx lobes, and a deep pink and broadly urceolate corolla. It grows on exposed areas and among sulfur vents at and near the summit of Mt. Apo. Vaccinium gamay most closely resembles V. gitingense, but differs in having shorter inflorescences, early caducous inflorescence bracts, shorter pedicels, presence of clavate glands on the hypanthium, and an absence of anther spurs. It grows on exposed areas in the ultramafic forest of Mt. Hamiguitan. It is one of only two Philippine Vaccinium species possessing distinctly callose-thickened calyx lobes, the other being V. gitingense. Vaccinium vomicum most closely resembles V. carmesinum, but differs by having smaller leaves, presence of glands on the extreme end of the leaf blade base, presence of clavate glands on the hypanthium, shorter stamens, and presence of stalked glands on the dentate apex of the tubules. It grows in the mossy rainforest of Mt. Kitanglad, and it is the only Philippine species of Vaccinium with glands on the extreme end of its leaf blade base. Following IUCN guidelines, we propose a conservation status of Critically Endangered for V. fallax, Endangered for V. gamay, and Data Deficient for V. vomicum. With these discoveries, the number of Vaccinium species in Mindanao Islands increases to 22 and in the Philippines to 44. Furthermore, the Mindanao Islands can now be considered the center of Vaccinium diversity in the Philippines.

Stingless bee foragers experience more thermally stressful microclimates and have wider thermal tolerance breadths than other worker subcastes

IntroductionThe current state of anthropogenic climate change is particularly concerning for tropical insects, species predicted to be the most negatively affected. Researching climatic tolerance in social insects is challenging because adaptations exist at both individual and societal levels. Division of labor research helps to bridge the gap between our understanding of these adaptations at different scales, which is important because social insects comprise a tremendous portion of global animal biomass, biodiversity, and ecosystem services. Considering how individual physiologies construct group-level adaptations can improve climate change impact assessments for social species. Tetragonisca angustula is a neotropical stingless bee species that exhibits high worker subcaste specialization with a morphologically distinct soldier caste.MethodsWe used this species to investigate 1) whether age- and size-differentiated subcastes differ in thermal tolerance, 2) which worker subcaste operates closest to their thermal limits, and 3) the extent to which this species selects active foraging times to offset thermal stress. We measured the thermal tolerance (CTmax and CTmin) of small-bodied foragers and two soldier subcastes (hovering guards and standing guards) in T. angustula.Results and discussionDespite body size differences between foragers and guards, no differences in the upper or lower thermal limits were observed. However, the average thermal tolerance breadth of foragers was significantly larger than that of guards, and foraging sites were more thermally variable than nest sites, supporting the Climatic Variability Hypothesis at a microclimate scale and in the context of division of labor. Warming tolerance was significantly lower among small-bodied foragers compared to hovering and standing guards. The magnitude of warming tolerances indicated low risk of imminent climate change impacts in this environment but suggests that increasing temperatures and heatwave prevalence may cause foragers to meet their upper thermal limits before other subcastes. Foraging occurred at a narrower range of temperatures than would challenge critical temperatures, with higher morning activity. Directionally increasing temperatures will likely confine these preferred foraging temperatures to a narrower time window. Further study is needed to elucidate how foragers may shift times of activity in response to anthropogenic warming, but changing climates may impact plant pollination rates in natural and agricultural systems.

A preliminary study of the morphological variation of rhizomes in Zingiber Mill. and its role in taxonomy

The rhizomes of Zingiber are highly diverse and have potential in taxonomy, but their fundamental structure has never been properly understood in connection with an understanding of the sympodial growth form of the whole plant. This study is based on a literature review and on observations of fresh materials of 32 Zingiber species mainly from China, representing all four sections of the genus. An analysis of the sympodial modular growth habit of these plants has recognised that both isomodular and heteromodular growth exist within the genus. The study shows that rhizomes of Zingiber are highly-organised, compound, sympodial structures. By introducing the term rhizome unit, Zingiber rhizomes can be meaningfully described by depicting the morphology of the rhizome units and the relative arrangement of these units to one another. Six morphological attributes of rhizome units (shape, size, direction of growth, colour and number of nodes per rhizome, and length of internodes) and two attributes of their relative arrangement to one another (dorsiventral vs lateral position of rhizome units and the ramification position along the length of rhizome unit) are discussed. A preliminary assessment of variation patterns and the taxonomic value of these characters are presented. Together, these attributes contribute to the overall morphology of rhizomes. The relationship between rhizome structure and the above-ground clumping habit is discussed. The term pseudo-neck is coined to refer to the narrowed basal part that occurs in the rhizome units of some Zingiber species while the thick apical part of rhizome units where the internodes are often shorter than those on the pseudo-neck is called head. Problems with existing terminology for rhizome and plant habit descriptions in Zingiber are highlighted. This study suggests that whether the plane of distichy of leaves is parallel or perpendicular to the rhizome unit, a key character that many previous studies used for subdivision of Zingiberaceae, needs re-assessment, because in Zingiber both states of the character exist. Characters of rhizome morphology of the four sections in Zingiber are discussed, but studies of a larger number of species are needed to better-assess the relevance of these characters to the infrageneric classification of the genus. Schematic illustrations and colour plates of rhizomes from representative species are provided to assist the descriptions and discussions. It is hoped that this preliminary study will facilitate and encourage more comprehensive studies of rhizomes of Zingiber and of other genera within Zingiberaceae. Such work will lead to a better understanding of these structures and help establish a more comprehensive and accurate terminology for them, which in turn will facilitate the taxonomy and identification of the family.

New eusuchian cranial remains from the Upper Cretaceous of the southern Pyrenees

ABSTRACT Allodaposuchids were among the most common crocodyliforms in the Upper Cretaceous of Europe. The clade, recently erected to include a large number of species described in the last decade, seems to hold a remarkable diversity that has generated systematic controversies. Here we describe an interorbital fragment of an eusuchian crocodyliform, collected in the late 1950s in the locality of Suterranya-Mina de lignit (Lleida, Spain), from the lower Maastrichtian deposits of the Tremp Group, in the southern Pyrenees. The specimen is here identified as an allodaposuchid; some already described teeth, probably found together with the cranial remains and therefore here assigned to the same individual, reinforce this interpretation. The interorbital region of the specimen shows some important similarities with Allodaposuchus subjuniperus, reported only from the upper Maastrichtian levels of the Tremp Group, while it clearly differs from Allodaposuchus palustris, which is already reported in the lower Maastrichtian transitional deposits close to Suterranya-Mina de lignit locality. This study shows that at least three different species of allodaposuchids can be found in the lower Maastrichtian deposits of the Tremp Group.

Analysis Of Hybrid Solutions For Coastal Protection Combining Physical And Numerical Cfd Modeling

Historically, flooding and erosion challenges in coastal areas have been addressed through conventional gray/rigid structures such as breakwaters, dikes, and walls (Morris et al., 2017). As a consequence of the context of climate change, which is accompanied by a global biodiversity crisis and an increasing risk to coastal systems and communities, Nature-based Solutions (NbS) have emerged in recent years as an alternative to conventional engineering options. NbS can completely or partially mitigate coastal flooding and erosion problems while offering several additional co-benefits, such as carbon sequestration, improved water quality, habitat creation, and more (Sutton-Grier et al., 2015). Nevertheless, NbS may not be effective on their own in areas where there is insufficient available space for their development or in high-risk areas. In such cases, combining conventional engineering with nature-based solutions to obtain a so-called hybrid solution can represent an optimal approach, capable of providing the necessary risk reduction and realizing the benefits associated with natural solutions (Vuik et al., 2016). This makes hybrid solutions a highly attractive option that is currently gaining increasing interest. However, due to the limited number of real cases implemented, their relatively novel nature, and existing gaps in our knowledge about their hydrodynamic behavior, there is a pressing need to study hybrid solutions in greater detail. To this end, an experimental campaign is being conducted and is complemented by numerical CFD modeling, coupling IH2VOF and OpenFOAM models, to better understand the coastal protection services provided by the combined solution and to assess the suitability of the method of process superposition, commonly used to analyze the interaction between the flow and the hybrid solution. The main variables analyzed for this purpose are the evolution of wave height and wave run-up.